40088809 has 2 divisors, whose sum is σ = 40088810. Its totient is φ = 40088808.

The previous prime is 40088777. The next prime is 40088813. The reversal of 40088809 is 90888004.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 33698025 + 6390784 = 5805^2 + 2528^2 .

It is a cyclic number.

It is not a de Polignac number, because 40088809 - 2⁵ = 40088777 is a prime.

It is a super-2 number, since 2×40088809² = 3214225214076962, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (40088849) by changing a digit.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20044404 + 20044405.

It is an arithmetic number, because the mean of its divisors is an integer number (20044405).

Almost surely, 2^40088809 is an apocalyptic number.

It is an amenable number.

40088809 is a deficient number, since it is larger than the sum of its proper divisors (1).

40088809 is an equidigital number, since it uses as much as digits as its factorization.

40088809 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 18432, while the sum is 37.

The square root of 40088809 is about 6331.5723955428. The cubic root of 40088809 is about 342.2481043413.

The spelling of 40088809 in words is "forty million, eighty-eight thousand, eight hundred nine".